package com.wyhgs.reggie.filter;

/**
 * @author 宛远鸿
 * @version 1.0
 */

import com.alibaba.fastjson.JSON;
import com.wyhgs.reggie.common.BaseContext;
import com.wyhgs.reggie.common.R;
import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import java.io.IOException;

/**
 * 检查用户是否完成登录
 */
@WebFilter(filterName ="LoginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException{
        HttpServletRequest request=(HttpServletRequest) servletRequest;
        HttpServletResponse response=(HttpServletResponse) servletResponse;
        log.info("拦截到请求：{}",request.getRequestURL());

        //1、获取本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("拦截到请求:{}",requestURI);
        //定义不需要处理的请求路径
        String [] urls=new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/login",
                "/user/sendMsg",
//                "/doc.html",
//                "/webjars/**",
//                "/swagger-resources",
//                "/v2/api-docs"
        };

        //2、判断本次请求是否需要处理
        boolean check = check(urls, requestURI);

        //3、如果不需要处理，则直接放行
        if (check) {
            log.info("本次请求不需要处理：{}",requestURI);
        filterChain.doFilter(request,response);
        return;
        }

        //4-1、判断登录状态，如果已登录，则直接放行
        Object employee = request.getSession().getAttribute("employee");
        if(employee!=null){
            log.info("用户已登录，用户id为：{}",employee);

            Long empId = (Long) employee;
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request,response);
            return;
        }

        //4-2、判断登录状态，如果已登录，则直接放行 移动端
        Object user = request.getSession().getAttribute("user");
        if(user!=null){
            log.info("用户已登录，用户id为：{}",user);

            Long userId = (Long) user;
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;
        }

        log.info("用户未登录");
        //5、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
            response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    /**
     * 路径匹配，检查本次请求是否需要放行
     * @param urls
     * @param requestURL
     * @return
     */
    public boolean check(String[] urls,String requestURL){
        for (String url:urls) {
            boolean match = PATH_MATCHER.match(url, requestURL);
            if (match) {
                return true;
            }
        }
        return false;
    }
}
